package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * @author 程达
 * @PackageName:com.itheima.reggie.service.impl
 * @ClassName:CategoryServiceImpl
 * @Description:
 * @date 2022/5/25 14:48
 **/
@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {
    @Autowired
    private DishService dishService;//注入setmealService去查询菜品是否有关联数据
    @Autowired
    private SetmealService setmealService;//注入setmealService去查询套餐是否有关联数据

    // 根据id删除分类，删除之前需要进行判断
    @Override
    public void remove(Long id) {
        //添加查询条件，根据分类id进行查询菜品数据
        LambdaQueryWrapper<Dish> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(Dish::getCategoryId,id);
        int count1 = dishService.count(wrapper);
        //如果已经关联，抛出一个业务异常
        //如果已经关联，抛出一个业务异常
        if(count1 > 0){
            throw new CustomException("当前分类下关联了菜品，不能删除");
        }

        //查询当前分类是否关联了套餐，如果已经关联，抛出一个业务异常
        LambdaQueryWrapper<Setmeal> wrapper2 = new LambdaQueryWrapper<>();
        wrapper2.eq(Setmeal::getCategoryId,id);
        int count2 = setmealService.count(wrapper2);
        if(count2 > 0){
            throw new CustomException("当前分类下关联了套餐，不能删除");
        }
        //正常删除分类
        super.removeById(id);

    }
}